DAV Class 6 Science Chapter 9 Solutions

DAV Class 6 Science Chapter 9 Solutions Structure and Function of the Living Organisms – Animals is given below.

DAV Solutions for Class 6 Science will help you in building a strong foundation for advanced topics that you study in your future classes. Here different types of questions provided in DAV Class 6 Science Chapter 9 Solutions solutions will create a problem-solving ability in you, which is important from the science exam point of view.

DAV Class 6 Science Chapter 9 Solutions Structure and Function of the Living Organisms – Animals

Highlights

• A. Fill in the blanks.
• B. True or False.
• C. Tick the correct option.
• D. Answer the following questions in brief.
• E. Answer the following questions.

A. Fill in the blanks.

1. The process, of breaking down of food, into fine and soluble particles, is called ___________.

2. Blood vessels, that carry blood from organs to heart, are called ___________.

3. The nervous system consists of billions of ___________

4. The ___________ portion of the brain controls the left part of the body.

5. Kidneys are ___________ shaped organs that help in filtering out waste products.

6. The skin removes water, and excessive salts, in the form of ___________.

7. The male reproductive organ system has a pair of ___________.

Answer: (1) digestion (2) veins (3) nerve cells (4) right (5) bean (6) sweat (7) testes

B. Write True or False for the following statements.

1. Large intestine is responsible for the digestion and absorption of food.

2. Pharynx is also called as the ‘voice box.

3. Blood helps in maintaining our body temperature at a constant value.

4. The blood vessels, which take blood away from the heart, to various parts of the body, are called arteries.

5. Kidneys filter out waste products from the blood.

Answer: (1) True (2) False (3) True (4) True (5) True

C. Tick the correct option.

Answer:

1. liver

2. stomach

3. spinal cord

4. kidneys

5. reproductive system

D. Answer the following questions in brief.

1. How many teeth are present in a four-month-old child’s mouth?

Answer: No teeth.

2. Where is saliva produced?

Answer: Saliva is produced in the mouth.

3. Define respiration.

Answer: Respiration is the process in which oxygen is taken in, and Carbon dioxide is released from the body.

4. Name the flap that shuts off the wind pipe when you swallow food.

Answer: Epiglottis

5. How many types of vessels are found in the circulatory system of human beings?

Answer: There are three types of vessels are found in the circulatory system of human beings.

6. List down the main organs of the nervous system.

Answer: Brain, Spinal Cord, Nerves, Sense Organs.

7. Name the structure that protects the spinal cord.

Answer: Vertebrae 

8. Name the process of fusion of an egg with a sperm.

Answer: Fertilisation

E. Answer the following questions.

1. What is digestion? Starting from the mouth, state the various steps involved in digestion.

Answer:  The process of breakdown of food into very fine and soluble particles is Called digestion.

Step 1: Mouth – In mouth saliva helps to moisten and soften the food so that it can be easily swallowed. 

Step 2: Food pipe – food pipe is a muscular organ that pushes the food down into the stomach. 

Step 3: Stomach – in our stomach the food gets mixed with the gastric juice secreted by the gastric glands of the stomach. Gastric juice helps in digestion of food.

Step 4: Liver and Pancreas- liver secretes bile juice and pancreas secrete pancreatic juice which contain certain enzymes that helps in the digestion of food.

 Step 5: small intestine – The small intestine absorbs nutrients from the digested food and send them to all the parts of the body through the blood.

Step 6: Large intestine – The large intestine helps in absorption of water from the undigested food which is then pushed out as waste.

2. Draw a diagram of the tongue and show the location of the taste buds on it.

Answer: For diagram see page no. 142 of your science book.

3. Explain the role of diaphragm in the process of breathing.

Answer: Lungs cannot move by themselves; it is the movement of the diaphragm and the muscles between the ribs of the chest wall that causes the expansion and contraction of the lungs. Thus, breathing takes place.

4. Give the function of the heart, and the blood vessels, in the circulatory system.

Answer:

the main function of the heart is to pump blood and keep it moving in the blood vessels. Functions of blood vessels:

1. Arteries – Arteries take blood away from the heart to various parts of the body.

2. Veins – Bring blood back to the heart from different parts of the body.

3. Capillaries – These are very fine vessels which connect arteries and veins to each other.

5. State the function of the nervous system. Briefly explain the role of nerves in it.

Answer: nervous system controls and coordinates all the activities of our body.

Functions of nerves: nerves are of two types 

1. Sensory nerves – carry messages from sense organs to the brain.

2. Motor nerves – carry commands given by the brain to the muscles.

6. Give a brief outline of the process of excretion, by the kidneys, in human beings.

Answer: kidneys filter out waste products from the blood. These wastes form a light-yellow liquid called the urine. In this way, the blood gets purified by the kidneys. Kidneys help in removing not only harmful substances such as urea but also excess water from the blood.